Intuitive design, fast and safe - Our diamond tester comes with an LCD screen and LED indicators for easy reading of accurate test results. This diamond selector is designed for fast, accurate, and safe diamond testing, ensuring that the diamond is not damaged during the test. Provides accurate results every time. It is popular among professionals, amateurs, coin enthusiasts, and business owners. Excellent value for money. Great gifts. Easy testing - Key operation, easy to see. No professional required - The diamond test pen is easy to use. Just turn it on, gently press the tip against the gemstone, and wait for the beep to know if it's real or fake. If it's a real diamond. Professional diamond testers light up more than 9 and make sounds. Non-responsive means the stone is imitation crystal or similar cubic zirconia (). Key press, easy to use - Place the pen tip vertically and gently on the test stone. Adjust according to the size of the gemstone you want to measure. The instrument's up/down buttons adjust the number of carats displayed below according to the instrument, you don't need to enter the exact number of carats. But remember, for diamonds (1.0 carat), light up 1 green light; for diamonds (0.5 carat), light up 2 green lights. For small gemstones (like cutting or cone), light up 3-4 green lights. (Be careful not to touch the instrument's buttons during testing) High-frequency sound during metal testing - High-frequency sound during metal testing is due to the working principle of the test pen, which is based on thermal conductivity to distinguish between diamonds and fake gemstones. Since metal has a similar thermal conductivity to a diamond, high-frequency sounds are produced during the test. [Warm reminder]: Make sure to follow correct testing procedures and avoid using diamond testers on inappropriate objects (metal, skin, water, etc.) to get accurate test results. Improper use can affect the accuracy of the test. Before using the diamond tester, we must select the diamond size. Otherwise, we may get inaccurate results. [Hand-operated touch screen]: We must touch the panel on the back during testing. Otherwise, we will get inaccurate results. [Fault contact]: When we touch the fault, this diamond test pen flashes or shuts down. When testing metal, skin, or anything else. Color: As shown Material: Plastic Package contents: 1 x diamond test pen 1 x 1M USB cable 1 x test platform Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.